Air Gapped Network

 Air-Gapped Network Example

The network on the left is the main network for the organization and is connected to the Internet. 

The network on the right is not connected to the main network or the Internet. 

An air-gapped network is physically isolated from the main network and the Internet. It is used in government offices, research and development, and any other network that needs to be completely isolated. 

NIC (Network Interface Card) Teaming

 NIC Teaming - Fault Tolerance

For the CompTIA Security+ Exam

NIC teaming uses multiple network connections from a single server. Instead of 1 Gbps, you now have 4 Gbps. This provides redundancy and fault tolerance, giving you uptime.

You must use LACP (Link Aggregation Control Protocol) on the switch to prevent a switching loop. Even if a port fails, you still have 3 Gbps. 

Learn Programming Languages, Linux Commands, Keyboard Shortcuts

Cheat Sheets - Programming Languages & More

This site is more than learning programming languages, references, and cheat sheets. It also covers many Linux commands, Databases, and keyboard shortcuts for several applications. 

This site can actually help those studying for many CompTIA exams. You can learn how the output for different languages can better help you understand ITF+ questions. 

The Linux commands will also help those taking the CompTIA Security+ exam understand what the commands do and be able to look at log outputs to decipher what has happened.

CompTIA Security+ (SY0-701) Exam Preparation

 SY0-701 Site for Better Understanding

This site will help students better prepare for the CompTIA Security+ (SY0-701) exam. It covers many objectives, such as Cryptography, Access Control Methods, Incident Response, Vulnerability Management, SIEM (Security Information and Event Management), SOAR (Security Orchestration and Automated Response), Social Engineering, Malware, Penetration Testing, Cloud Security, Secure Coding Practices, and Risk Management.

Traffic Analysis Tools - Part 1

 Throughput Testers

To test your network's performance, you can transfer a large file between 2 PCs. Take the size of the data and divide it by the time it took for the transfer to complete. Several online throughput calculators can help you.

The best way to test throughput on your network is to perform the test during the busy part of the day.

Here is a listing of a few throughput testers:

• iperf: iperf
• Ttcp: Ttcp
• bwping: bwping

Security Checklist: Internet, Physical, Human Related Preventions

 Digital Defense Checklist

The following video is closely related to the security that needs to be employed to keep our data safe. This is an excellent site to use to lock down areas that you might have missed:

Video Types, Connectors, Audio, Video

 Video Types & Connectors

This post will help those taking the CompTIA ITF+ and A+ exams.

Our goal is to show a visual representation of the connectors, whether they use analog or digital signals, and whether they provide video only or video and audio.

Composite video provided video and audio. The video signal was analog only. The connecting cables are called RCA connectors.

The VGA (Video Graphics Array) provided an analog signal for video; there was no audio. The connector has 15 pins.

DVI (Digital Visual Interface) is used for video only. The connector dictates what signal is being provided. 

DVI-A signal is analog only

DVI-D signal is digital only

DVI-I can be used with either analog or digital signals.

DisplayPort provides a digital signal for video and audio. A single DisplayPort connector on the PC can be used to create a dual monitor setup, which can be daisy-chained.

Thunderbolt provides both video and audio in a digital format. Like DisplayPort, it only needs one port for dual monitors. Thunderbolt is also used for data transfer.

HDMI delivers both video and audio in a digital format.